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- 저자 : 옥진희(Ok, Jinhee) (검색결과 3 건)
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The development of PEMFC cathode using polyol method with directly grown CNT on carbon paper
옥진희(Ok, Jinhee),이준기(Rhee, Junki),Altalsukh, Dorjgotov,박상선(Park, Sangsun),설용건(Shul, Yonggun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Since the discovery of the carbon nanotube(CNTs), they have attracted much attention because of unique properties that may impact many fields of science and technology. The considerable properties of CNTs include high surface area, outstanding thermal, electrical conductivity and mechanical stability. However, uniform deposition of Pt nanoparticles on carbon surface remains inaccessible territory because of the inert carbon surface. In this study, we prepared directly oriented CNTs on carbon paper as a catalyst support in cathode electrode. carbon surface was functionalized using aryl diazonium salt for increasing adhesion of Ni particles which is precursor for growing CNTs. For fabricate electrode, CNTs on carbon paper were grown by chemical vapor deposition using Ni catalyst and Pt nanoparticles were deposited on CNTs oriented carbon paper by polyol method. The performance was measured using Proton electrolyte Membrane Fuel Cell(PEMFC). The structure and morphology of the Pt nanoparticles on CNTs were characterized by Scanning electron Microscopy(SEM) and Transmission electron Microscopy (TEM). The average diameter of Pt nanoparticles was 3nm.
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The development of complex electrode for fuel cell using CNT
옥진희(Ok, Jinhee),이준기(Rhee, Junki),Altalsukh, Dorjgotov,Rhee, Junki,박상선(Park, Sangsun),설용건(Shul, Yonggun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Carbon nanotube(CNT) has been spotlighted as a promising candidate for catalyst support material for PEMFC (proton exchange membrane fuel cell). The considerable properties of CNT include high surface area, outstanding thermal, electrical conductivity and mechanical stability. In this study, to fully utilize the properties of CNTs, we prepared directly oriented CNT on carbon paper as a catalyst support in the cathode electrode. The CNT layer was prepared by a chemical vapor deposition(CVD) process. And the Pt particles were deposited on the CNT oriented carbon paper by impregnation and eletro-deposition method. The potential advantages of directly oriented CNT on carbon paper can include improved thermal and charge transfer through direct contact between the electrolyte and the electrode and enhanced exposure of Pt catalyst sites during the reaction.
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玉眞姬,沈富子 東亞大學校附設基礎科學硏究所 1989 基礎科學硏究論文集 Vol.6 No.1
運動量 차이에 따른 人體適應變化(皮膚溫, 衣服氣候, 生理的 反應, 心理的 反應)을 규명하고자, 환경조건을 氣溫 26±0.5℃ , 濕度 60±10%, 氣流 0.2m/sec 상태에서 polyester 100%인 pants와 shirts를 選定하여, 특별한 스포츠 活動을 한 經驗이 없는 建康한 남자대학생 5명에게 着用시켜 運動負荷量을 3段階로 設定하고 運動前, 運動中, 運動後의 人體適應變化를 測定하고, 考察한 結果 다음과 같은 結論을 얻었다. 1. 皮膚溫은 運動에 의하여 胸部, 背部, 下腿前面, 足背의 경우는 運動中 上昇한 後, 運動後에는 다시 下降하는 傾向이었으며, 그 外 부위에서는 모두 運動初期에는 약간 下降한後, 다시 上昇하다가 運動後 다시 減少하였는데, 특히 腹部의 경우는 運動終了까지 계속 下降한 後, 運動終了와 함께 다시 상승한 다음 下降하였다. 그리고 이러한 傾向은 運動負荷量이 클수록 크게 나타났다. 2. 衣服下溫度는 전체적으로 運動에 의하여 上昇하다가 어느 시점부터 다시 下降하는 傾向이었으며, 運動負荷量이 클수록 그 傾向이 클 뿐아니라 상승시간도 길어져서, 運動負荷量 200m/min에서는 運動이 끝난 後에도 5분간은 계속 上昇한 後 下降하였다. 衣服下濕度는 運動의 시작과 함께 급속히 上昇하기 시작하여 運動이 끝난 후 5분까지 계속 上昇한 후 서서히 저하하였으며 그 傾向은 運動負荷量이 클수록 크게 나타났다. 3. 體溫은 運動에 의하여 거의 變化를 보이지 않았다. 血壓 및 脈博은 運動에 의하여 上昇한 後 運動이 끝남과 동시에 下降하였으며, 그 傾向은 血壓中에서도 最高血壓의 경우가 더욱 크게 나타났다. 4. 주관적인 반응인 온냉감, 습윤감, 쾌적감은 운동에 따른 산열 및 발한량의 영향으로 운동량이 증가함에 따라 상승함을 보였다. The purpose of this study was to investigate the adaptation of the human body to the variation of the amount of exercise. The skin temperature, physiological and psychological reactions of five selected healthy college men with no experience of the particular sport activites, who exercised for 15 minutes with three degrees of intensities (140, 170, 200 m /min) under a particular condition. The wore shirts and pants made of polyester knit fabric. The results were obtained as follow. 1. The skin temperature of the chest, the back, the thigh, and the foot was increaed with exercises, and decreased after exercises. Those of the other regions of the body were decreased a little at the initial stage of the exercise and increased, and then decreased after the exercise, especially that of the breast was decreased continuously until the exercise ended and increased for 5 minutes after exercise ended, and then decreased. The heavier the exercise intensity was, the greater the above mentioned tendencies were. 2. The temperature under clothes was increased with exercise until any point of time and decreased after wards, and the increasing period of time as well as the tendency were increased with the intensity of exercise. The humidity under clothes was increased rapidly with the exercise and decreased gradually after exercise, and the tendency was increased with the intensity of exercise too. 3. The oral temperature varied very little. But the blood pressure and pulse were increased with exercise, and decreased after the exercise ended, and the tendency of the maximum blood pressure was greater than that of the minimum blood pressure, especially, the blood pressure at the point of exerecise ended, for the exercise intensities of 170 and 200m/min, and the pulse even after about one hour for all exercise intensities were exceeded by the normal limits of the human body. 4. The thermal and moisture sensations, just after the exercise ended were shown as "warm" and "humid"of about 140 and 170m/min of exercise intensities, "hot" "very humid" of 200m/min of exercise intensity, repectively. The comfort sensation, just after exercise ended, were shown as "slightly comfortable" for 140m/min of exercise intensity, "slightly uncomfortable" and "uncomfortable" for 170 and 200m/ min of exercise intensities, repectively.
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